Strap-extension device



Janv-29, .1929.

v J. DALo STRAP EXTENS ION DEVICE Filed Feb. l1, 1928 ,4 INVENTOR.

J/z d/ A TTORNEYS.

I ed by a relative sliding of the parts Parental Jan. 29, y i929.

,UNITED STATES vPATENT OFFICE- JoHN DALo, or InovrDENcE, RHODE ISLAND, AssIGNor. To A AND z CHAIN com: PANN,- or PROVIDENCE, nHoDE ISLAND, A conronArIoN 0E :RHODE ISLAND.

erm-EXTENSION DEVICE,

vThis invention relates to an extension device of the type more particularly employed in a wrist watch strap to extend the length o f the strap for passing the strap and watch over the hand of the wearer without disconnecting the ends of the strap from the watch; and has for its object to provide a compact extenslon member which may have a greater extension than that provided by the unfolding of its arts. y

p A further object of the invention is the provision of a plurality of foldable sections with one section provided with a pluralityof sliding parts such that when the sections are unfolded to extend the eectivelength .of the strap, a still further extension may be afford- Of one or more of the sections.

A still further object of the invention is the provision of a simple andeffective clasp for securing the parts together which will'coo erate with the means for securing one of tlie strap parts to one of the sections. v

rlliis invention further consists of the provision of a tip on one of the strapparts which is secured to the end of one of the sections beneath which an extension of another of p said sections may be releasably snapped to lhold the section in folded position.

yWith these and other objects in view, the invention consists 0f certain novel features of construction, as will be more fully described,

and particularly pointed out in the appended claims.

'In the accompanying drawings:

Fig. l is a top plan view of a wrist watch strap with the extension device positioned intermediate its ends.

Fig. 2 is a perspective view ofthe body section at one'end ofthe device.

Fig. 3 is a section. v f- Fig. 4 is a perspective view ofone of the parts ,of the intermediate section.

Fig. 5 is a perspective view of the other part of the intermediate section.

Fig. 6 is a perspective view illustrating the sections assembled andin unfolded position with the sliding parts of the intermediate sections partially extended.

- Fig. 7' is a fragmental detail showing the perspective View of another end 'f lustrating the hinge connection of the inter mediate section thereto.

Fig. 8 is a sectional view on line 8-8 of Fig. 7 Y* A Fig. 9 is a sectional view through the intermediate section showing the relative arrangement ofthe two parts thereof.

Fig. l0 is a sectional side view showing the relative position of the parts upon their initial movement from folded to unfolded posit1on. t i

Fig. 11 is a sectional side view similar to Fig. 10 showing the parts in folded position.

It is desirable to provide in a watch strap an extensiondevice which may `be manipu- .lated to extend the etfectivejlength of the in order to provide an Increased extension of a plurality of folded sections', I have formed one of these sections with a plurality of sliding parts to permit of further extension after Vthe sections haver been .unfolded to further tions; and the following is a detailed description of the present embodiment of this invention showing one 'construction by which these advantageous results may be accomplished.

With reference `to the drawings, l5 designates an end or body section which is formed with side walls 16 and 17 having openings 18 therein to receive means for securing the end of one part of the strap in adjusted position therein, 19 designates the other end section and between these end sections there is hinged an intermediate section 20 which is composed of two parts 21 and 22 slidably fitted together.

Section 22 has guides formed by folding in the edges 23, as clearly illustrated in Fig. 5, to slidably receive and guide in its movement the section 21. A slot 24 of'a length less than the section 21 therein receives a linger abutment 25 cut and bent up from the stock of the section 22, to limi-t the relative sliding move- .ment of the parts of the intermediate section. Ears 26 are provided on one of the parts of the intermediate section to receive a pivot pin 27 to hingedly connect it to the side walls of body section 15 while spaced eyes 28 .are formed on the other part ofthe intermediate section to cooperate with an eye 29 on theend section 19 and receive a pintle 30 to hingedly connect section 19 to the intermediate section 20.

The Watch strap is formed in two parts 31 and 32, each being provided with suitable means 33 to connect the ends to the strap bars.

or bails of a wrist watch, the: opposite ends of each of these strap parts are connected to the extension device. Strap part 31 is provided with a tip 34 which is suitably secured thereto and provided with a tubular portion 35 With turned-in edges 36 in Whichrtrunnions 37 are mounted and forced outwardly by means of a spring 38 which affords a means for adjustably mounting this end of the strap in the body section as the trunnions 37 may be engaged in any one of the holes 18 in the side walls of the body section.

The end of the strap part 32 is provided with a tip 39 secured thereto and provided with a tubular portion 40 through which a pivot pin 41 extends to connect it to the ears 42 on the end section 19.

` The sections are held in folded position by a portion 43 of the intermediate section being extended to a suficient length to snap beneath the tip 40, as is clearly illustrated in Fig. 11, whereby a simple and yet effective lock is provided to hold the sections in folded position.

I t will of course be apparent from the foregoing that the sections may be snapped apart, as illustrated in Fig. 10, and then unfolded, as illustrated in Fig. 6, after which the parts 21 and 22 of the intermediate section may be further extended by a relative sliding of the parts one upon the other to increase the eii'eo` tive length of the strap.

In initially snapping the partsfrom locked position the finger piece 45 extending from the body 15 may be utilized for convenience lof operation, if desired.

lThe foregoing description is directed solely towards the construction illustrated, but vI desire it 'to be understood that I reserve the privilege of resorting` to all the mechanical changes to which the device is susceptible, the invention being defined and limitedonly by the terms of the appended claims..l i

Iclaim: i

,1. In an extension device for a wrist watch strap, a plurality of sections hinged together to fold one on another, one olf said sections comprising two parts slidable one on the other, means for retaining said-sections iny Jfolded position and at the same time preventing sliding of-the parts one on the other whereby said sections must be unfolded to slide the parts one on the other.

2. In an extension device for a wrist watch strap, a plurality of sections hinged together to be folded one on the other, one of said sections comprising a' plurality of parts slidable one on the other, means permittin free but limited relative sliding movement og'the parts of said section only when said sections are unfolded.

3. In an extension device for a wrist watch strap, a plurality of sections hinged together to be folded one on another, one of said sections comprising a plurality of parts slidable one on the other, one of said parts having means for guiding another of said parts in its sliding movement, formations between said parts separate. from said guiding means to permit free but limited sliding movement within limits less than the length of one of the parts upon unfolding of said sections, and means for preventing sliding of the parts when folded. l

4. In combination, a pair of straps, an extension device comprising a-plurality of sections hinged together, ,the ends of said straps secured to the ends of said device, one of said sections comprising a plurality of parts slidable one on the other, folded-in edges on one of said parts and another of said parts being of a width to extend beneath and be embraced and guided by said folded-in edges in the relative sliding movement.

5. In an extension device for a Wrist watch strap, a plurality of sections hinged'together to be folded one on another, one of said sec tions comprising a plurality of parts slidable one on the other, and limiting means for the movement of said parts consisting of a slot in one part extending a portion of the length.

thereof and a protuberanee on the other of said parts extending into said slot, and means for permitting sliding of the parts only when unfolded.

6. In combination, a air of strap parts. a device comprising a bo y section having side .walls with a plurality of spaced openings therein, a tip carried by an end portion of one of saidstrap parts, resiliently-mounted trunnions extending from the edges of said tip to engage an one of a pair of the spaced openings in sald side walls for adjustment relative to the body section, end and intermediate sections hinged together, means for securing i an end of the other of said strap parts to the free end, of said end section, means for hinging the intermediate section to said body section, said intermediate section comprising a plurality of relatively slidable parts, and means for limiting the sliding movement o said parts consisting of a slot in one part and a finger on the other part slidable in said slot.

7. In combination, a pair of strap parts, a device comprising va body section having side walls with a plurality of spaced openings therein, a tip carried by an end portion of one of said strap parts, resiliently mounted trunnions extending from the edges of said tip to engage any one of a pair of'the spaced openings in said side walls for adjustment relative to the body section, an intermediate section comprising two parts, one of said parts having a slot therein terminating short of the end thereof, means for hinging said slotted part to said body section, the other of said section parts having an abutment slidabl in said slot to limit the movement thereof and ,its edges folded inwardly to receive and guide said slotted part, and an end section lhinged to the section part carrying said abutment, and means to secure the other of said strap parts to the free end of said end section.

8. In combination, a device comprising a plurality of sections hinged together to fold one upon the other, a pair of strap parts, means for securingone end of one of the strap parts to one of the-sections, means extending transversely of another section for securin an end of the other strap part thereto, an the end of still another section cooperating withv said last named strap securing means to lock the sections in folded position. 9. In combination, a device comprising a pair of end sections, an intermediate sectlon hinged at its ends to said end sections to permit folding one on another, a pair of strap parts, means for securing one end of one strap part to one end section, means for securing an end of the other strap part to the other end section, and means y,extending from the end of the intermediate section. to sna beneath the last said strap securing means y a resilient action of the parts to hold the sections in folded position.

10. In combination, a device comprising a pair of end sections, an intermedlate section hinged at its ends to said end sectlons to permit folding one on another, a pair of strap parts, means for securing one end of one strap part to one end section, a tip on the end of the other strap part, means for securing said tip to the other end section, and a portion extending from said intermediate section to snap beneath said tip and secure the sections in folded position.

11. In an extension device for a wrist watch strap, three sections hinged together to fold one on another, the section intermediate the end sections comprising two parts slidable `one on theother, securing means carried by the end sections for retaining the sections in folded position and preventing'sliding movement ofthe parts of the intermediate section.

12. In combination, a plurality of sections hinged together to fold one upon the other, a pair of straps, means for securing one end of one of the straps to one ofthe sections, an-

other of the sections having two parts slidable one on the other and held against sliding in one direction when said sections are-in folded position by said strap securing means, and means for attachin one end of the other strap to yet another o the sections.

13. In combination, a pair of straps, an extension device comprising a plurality of sections hinged together to be-folded one on 

